The Office of the Commissioner of Baseball announced that both Dominican Summer Leaguers received 50-game suspensions without pay for violating the Minor League Drug Prevention and Treatment Program. Rodriguez tested positive for metabolites of Stanozolol, while Montilla tested positive for metabolites of Nandrolone.

Both suspensions are effective immediately.

Rodriguez, 22, appeared in three games with the DSL White Sox this season, allowing 12 hits and seven runs over four innings. The 6-foot right-hander from San Cristobal spent the 2010 and 2011 seasons with the DSL Padres, appearing in eight game, and did not play in 2012.

Montilla, 20, was batting .234 with 11 RBIs and 16 stolen bases in 40 games for the DSL Angels this season, although he had not played since July 24. He appeared in 60 games with the club over the previous two summers.

Stanozolol is a synthetic anabolic steroid derived from testosterone that is sometimes prescribed by veterinarians to encourage muscle growth, red blood cell production, bone density and to stimulate the appetite of weakened animals. It's also been linked to bodybuilders and dozens of suspended Minor League players.

Nandrolone is an anabolic steroid that, in the past, has been used in the treatment of osteoporosis in postmenopausal women. It's commonly known as Deca-Durabolin and was one of the substances linked to the BALCO investigation.

The suspensions come one day after Cardinals prospect Yoenny Gonzalez was suspended 50 games following an undisclosed violation. Major League Baseball has suspended 41 players this year for violating the Minor League drug program.

Danny Wild is an editor for MiLB.com. This story was not subject to the approval of the National Association of Professional Baseball Leagues or its clubs.